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| Advanced Analog Technology, Inc. July 2008 AAT1500 Product information presented is current as of publication date. Details are subject to change without notice CONSTANT CURRENT BOOST CONVERTER FOR 1 TO 4 WHITE LEDS FEATURES Up to 4 LEDs at 2.8V Supply High Efficiency (85%) Output Over Voltage Protection HV Internal Switch 1 MHz PWM Switching Frequency Uses Tiny 1 mm Height Inductor 2.6V to 6V Input Range 0.1A Shutdown Current SOT23-5 , SOT23-6,TSOT23-6, and VSON8 Packages Available GENERAL DESCRIPTION The AAT1500 is a step-up converter that provides a solution to drive 1 to 4 white LEDs with a constant current from a lithium cell, and its switching frequency is fixed at 1 MHz. The AAT1500 offers a low 0.25V reference, which minimizes power loss in the current setting resistor and improves efficiency. Except in SOT23-5 package, protection features include output over voltage protections. The AAT1500 consists of a 0.1A shutdown current, and HV internal switch. Input supply range allows operation from 2.6V to 6V. The AAT1500 is available in SOT23-5, SOT23-6, TSOT23-6 and VSON8 packages. APPLICATIONS Palmtops MP3 Player Digital Still Cameras Portable Media Player Cell Phones and Smart Phones Electronic Information Organizers PIN CONFIGURATION TYPICAL APPLICATION V R1 = IE IR1 - Advanced Analog Technology, Inc. - Version 1.00 Page 1 of 14 - - Advanced Analog Technology, Inc. July 2008 AAT1500 ORDERING INFORMATION DEVICE TYPE AAT1500 PART NUMBER AAT1500 -S5-T AAT1500 -S3-T AAT1500 -S13-T AAT1500 -Q6-T PACKAGE S5:SOT 23-5 (SOT25) S3:SOT 23-6 (SOT26) S13:TSOT 23-6 (TSOT26) Q6:VSON 8-2.2*2.2 PACKING T: Tape and Reel T: Tape and Reel T: Tape and Reel T: Tape and Reel TEMP. RANGE -40 C to 85 C -40 C to 85 C -40 C to 85 C -40 C to +85 C MARKING 1500 1500 1500 1500 MARKING DESCRIPTION Device Type AAT1500 Device Type AAT1500 Device Type AAT1500 Device Type ABSOLUTE MAXIMUM RATINGS CHARACTERISTICS Supply Voltage SW, OVP to GND Other I/O Pin Voltage Junction Temperature Storage Temperature Range Operating Temperature Range Lead Temperature SYMBOL VALUE UNIT V V V VDD -0.3 to 7 -0.3 to 21 -0.3 to 6 125 C C C C TSTORAGE TC TL -45 C to +125 C -40 C to +85 C 260 C Note: Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended period of time may affect device reliability. RECOMMENDED OPERATING CONDITIONS CHARACTERISTICS Supply Voltage SYMBOL VALUE 2.6 to 6 UNIT V VDD - Advanced Analog Technology, Inc. - Version 1.00 Page 2 of 14 - - Advanced Analog Technology, Inc. July 2008 AAT1500 DISSIPATION RATINGS CHARACTERISTICS Package Thermal Resistance VSON8 SOT23-6 Power Dissipation, TC = 25 C VSON8 PACKAGE SOT23-6 SYMBOL VALUE 208 50 0.48 2 UNIT JA JA Pd Pd C /W C /W W W ELECTRICAL CHARACTERISTICS ( VDD = 3.6 V, TC = 25 C , unless otherwise specified.) Operating Condition PARAMETER Supply Voltage Under Voltage Lockout Operating Current Quiescent Current Shutdown Current SYMBOL TEST CONDITION MIN 2.6 1.8 2.2 TYP MAX 4.5 2.3 2 250 0.1 500 1 UNIT V V mA A A VDD VUVLO IDD VDD = 5.5V, Switch on IQ ISD VDD = 5.5V VFB = 1.3V, Switch off VDD = 5.5V, VEN < 0.4V Oscillator PARAMETER Operating Frequency Maximum Duty Cycle SYMBOL TEST CONDITION MIN 0.8 79 TYP 1.0 85 MAX 1.2 92 UNIT MHz % fOSC DMAX Reference Voltage PARAMETER Feedback Voltage SYMBOL TEST CONDITION Note MIN 0.237 TYP 0.250 MAX 0.263 UNIT V VIE Note: To measure the feedback voltage, the device VIE would connect to the application circuit. The inductance is 10 H and the output voltage equals 12V. - Advanced Analog Technology, Inc. - Version 1.00 Page 3 of 14 - - Advanced Analog Technology, Inc. July 2008 AAT1500 ELECTRICAL CHARACTERISTICS ( VDD = 3.6 V, TC = 25 C , unless otherwise specified.) N-Channel Switch PARAMETER Current Limit On-Resistance Leakage Current SYMBOL TEST CONDITION MIN 0.60 0.50 TYP 0.75 0.75 0.01 MAX 0.90 1.00 20.0 UNIT A ILIM RON ISWOFF VSW = 12V A Control and Protection PARAMETER EN pin Current OVP Threshold Chip Enable/Disable SYMBOL TEST CONDITION MIN TYP 4 14.5 Chip Enable Chip Disable 0.4 15.5 0.8 0.8 MAX 6 20.0 1.4 UNIT IEN VOVP VENH VENL A V V V - Advanced Analog Technology, Inc. - Version 1.00 Page 4 of 14 - - Advanced Analog Technology, Inc. July 2008 AAT1500 TYPICAL OPERATING CHARACTERISTICS Typical Application D1 D2 LED D3 LED D4 LED L1 4.7 H VIN : 2.6V~5.5V Efficiency vs. VO 92% 90% 88% AAT1500 1 2 SW VDD 6 C1 10 F 86% 84% 82% C2 10 F OVP 5 GND EN 4 3 IE R1 12.4 80% 78% 76% 3.5 6.5 9.5 12.5 Efficiency vs. VIN 94% 92% 90% 88% 86% 84% 82% 80% 78% 76% 2.5 3 95% VO (V) Efficiency vs. LED Current 2-LED 90% 1-LED 85% 3-LED 1-LED 3-LED 4-LED 80% 75% 70% 65% 60% 4-LED 2-LED 3.5 4 4.5 5 5.5 0 5 10 15 20 25 30 VIN (V) 22.5 22 21.5 21 20 20.5 20 19.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 19.5 19 18.5 3 4 LED Current (mA) 22 21.5 21 20.5 LED Current vs. VIN LED Current vs. VO 5 6 7 8 9 10 11 VIN (V) VO (V) - Advanced Analog Technology, Inc. - Version 1.00 Page 5 of 14 - - Advanced Analog Technology, Inc. July 2008 AAT1500 TYPICAL OPERATING CHARACTERISTICS C - Advanced Analog Technology, Inc. - Version 1.00 Page 6 of 14 - - Advanced Analog Technology, Inc. July 2008 AAT1500 PIN DESCRIPTION PIN NO SOT23-5 1 2 3 4 5 PIN NO SOT23-6 1 2 3 4 5 6 PIN NO TSOT23-6 1 2 3 4 5 6 PIN NO VSON8 8 4 6 3 1 2 7 5 NAME SW GND IE EN OVP I/O O I I I Switch Pin Ground Inverting Input Pin of error amplifier Chip Enable/Disable(Active High) Over Voltage Protection Supply Voltage SW MOS Ground Not Connected DESCRIPTION VDD GND1 NC FUCTION BLOCK DIAGRAM SOT23-5 - Advanced Analog Technology, Inc. - Version 1.00 Page 7 of 14 - - Advanced Analog Technology, Inc. July 2008 AAT1500 FUCTION BLOCK DIAGRAM SOT23-6 and TSOT23-6 VSON8 - Advanced Analog Technology, Inc. - Version 1.00 Page 8 of 14 - - Advanced Analog Technology, Inc. July 2008 AAT1500 TYPICAL APPLICATION CIRCUIT SOT23-5 R1 = VIE IR1 SOT23-6 and TSOT23-6 V R1 = IE IR1 VSON8 R1 = VIE IR1 - Advanced Analog Technology, Inc. - Version 1.00 Page 9 of 14 - - Advanced Analog Technology, Inc. July 2008 AAT1500 TYPICAL APPLI CATION CIRCUIT D R1 = V - VDS VIE , R 2 = IE IR1 IR 2 CLK VIE = 0.25 V ( typical) VDS = RDS( ON) x IR2 (MOSFET Spec.) S - Advanced Analog Technology, Inc. - Version 1.00 Page 10 of 14 - - Advanced Analog Technology, Inc. July 2008 AAT1500 PACKAGE DIMENSION SOT23-5(SOT25) Symbol A A1 A2 b c D E E1 e e1 L L1 L2 R R1 Dimensions In Millimeters MIN TYP MAX 1.05 1.20 1.35 ----------0.15 1.0 1.1 1.2 0.3 -----0.5 0.08 -----0.2 2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 1.90 BSC 0.35 0.45 0.55 0.60 REF 0.25 BSC 0.1 ----------0.10 -----0.25 0 3 5 10 10 7 1 - Advanced Analog Technology, Inc. - Version 1.00 Page 11 of 14 - - Advanced Analog Technology, Inc. July 2008 AAT1500 PACKAGE DIMENSION SOT23-6(SOT26) SYMBOL A A1 A2 b c D E E1 e e1 L L1 L2 R R1 Dimensions In Millimeters MIN TYP MAX 1.35 1.05 1.2 0.15 ----------1 1.1 1.2 0.4 0.55 -----0.08 0.2 -----2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 1.90 BSC 0.35 0.45 0.55 0.60 REF 0.25 BSC 0.10 ----------0.10 0.25 ------ 0 3 5 5 10 7 1 - Advanced Analog Technology, Inc. - Version 1.00 Page 12 of 14 - - Advanced Analog Technology, Inc. July 2008 AAT1500 PACKAGE DIMENSION TSOT23-6 (TSOT26) Symbol A A1 A2 b c D E E1 e e1 L L1 L2 R R1 Dimensions In Millimeters MIN TYP MAX 0.75 -----0.9 0 -----0.1 0.7 0.75 0.8 0.4 -----0.5 0.08 -----0.2 2.8 2.9 3 2.6 2.8 3 1.5 1.6 1.7 0.95 BSC 1.90 BSC 0.3 0.45 0.6 0.60 REF 0.25 BSC 0.1 ----------0.1 -----0.25 0 4 4 10 - 8 12 - 1 - Advanced Analog Technology, Inc. - Version 1.00 Page 13 of 14 Advanced Analog Technology, Inc. July 2008 AAT1500 PACKAGE DIMENSION VSON8 PIN1 INDENT C Chornfer:0.2 D A A1 D2 L Symbol A A1 b C D D2 E E2 e L y Dimensions In Millimeters MIN TYP MAX 0.8 0.9 1.0 0.00 0.02 0.05 0.20 0.25 0.30 0.19 0.20 0.25 2.1 2.2 2.3 1.0 1.1 1.2 2.1 2.2 2.3 1.5 1.6 1.7 -----0.55 -----0.25 0.35 0.45 0.000 -----0.076 - Advanced Analog Technology, Inc. - Version 1.00 Page 14 of 14 - - |
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